Sound and light wave apparatus



NOV- 14, 1933. N E JOAQUIN A I 1,934,859

SOUND AND LIGHT WAVE APPARATUS Filed Dec. 24, 1950 2 Sheefs-She'et 1 BYZYQRNEY Nov. 14, 1933. I N. E. JOAQUIN ET AL 1,934,859

SOUND AND LIGHT WAVE APPARATUS Filed Dec. 24, 1950 2 Sheets-Sheet 2 ig/aATTORNEY Patented Nov. 14, 1933 UNITED STATES PATENT OFFICE SOUND ANDLIGHT WAVE APPARATUS Nathan E. Joaquin and Edward Praetorius, LosAngeles, Calif., assignors of one-third to John E. Stewart, Los Angeles,Calif.

Application December 24, '1930 Serial No. 504,620

Claims.

provide a novel form of apparatus whereby a suitable motor functioningto actuate a movable means, such as a garage door, gate or other closureor apparatus, in which a vibratory means,

sensitive to sound waves, and preferably in diaphragm form, and/or avibratory means, sensitive to light waves, and preferably in phototubeand electron tube form, is adapted to operate said motor, preferably bymeans of one or more relays in circuit with said vibratory means, saidmotor and a source of electrical energy..

Another object of our invention is to provides,

novel form of switch mechanism or circuit interrupting means comprisinga vibratory diaphragm, of suitable material, such, for example as mica,associated in any preferred way with a casing of any preferredconstruction, in which casing may be positioned a non-arcing fluid, suchas kerosene or other suitable oil, with which diaphragm is associated inany preferred way an electrode responsive to and adapted to multiply thevibrations, or the amplitude of said vibrations, of said diaphragm, saidcasing having associated therewith, a movable electrode, which may beeither aspring, gravity or otherwise actuated ball, provision being madein said casing for guiding said electrode in its movement, and at thesame time permitting the free movement of said fluid.

The above, and further objects and advantages of our invention, as willhereinafter more fully appear, we attain by the construction describedin the specification, and illustrated in its preferred form on thedrawings, forming a part of our application.

Reference is had to the accompanying drawings, in which similarreference characters denote similar parts. In the drawings,

Fig. 1 is a fragmentarmmore or less diagrammatic perspective view of ourinvention shown applied to a movable door, which may be that of agarage,

Fig. 2 is an enlarged front elevational view of one form of vibratoryswitch mechanism or device,

Fig. .3 is a cross-sectional view, taken on the line 33, Fig. 2,

Figs. 4, 5 and 6 are views similar to Fig. 3, but showing modificationsthereof,

Fig. 7 is a side elevational view of one of the relays for the soundwave circuits,

Fig. 8 is a perspective view of the motor relay 0 for said circuit,

Fig. 9 is an enlarged, and very much exaggerated cross-sectionalfragmentary detail view of the convex diaphragm electrode associatedwith the vibratory diaphragm, and

Fig. 10 is a diagrammatic view of the electrical circuits for both soundsensitive and light sensitive devices.

Describing our invention more in detail, in its broader aspects saidinvention comprises an apparatus including a novel form of switchmechanism in which a vibratory diaphragm, sensitive to sound waves, uponbeing vibrated by any sound, such, for example as the horn of a motorvehicle, and/or a light sensitive device upon being acted upon by therays of light from say the headlights or other source of light, isadapted through a suitable relay mechanism to energize an electric motorto operate a closure or other part of movable machinery, as may bedesired.

More specifically our invention comprises an apparatus consisting of aspecial form of switch 2 having a suitable casing 4 with which isassociated in any preferred way, as by the fasteners 6, a vibratorydiaphragm 8 of suitable material, such 5 as mica, which may be soassociated with said casing as to render the same fluid tight, saidcasing, as seen more particularly in Fig. 3, being adapted to house toany preferred depth, a suitable non-arcing fluid, such as kerosene, orany other oil 18.

Associated with the vibratory diaphragm 8, in any manner in practicepreferred, as by a suitable glue, is a preferably convex diaphragm 10constructed of a material of electrical conductivity, thus forming anelectrode, the space within said convex diaphragm being fllled with airand sealed against leakage by said glue. It will thus be seen that anymovement of the diaphragm 8 will be conveyed to and greatly multipliedby the convex diaphragm 10, causing an eifective movement of a movableelectrode 12, which may take the form of a ball constructed of materialof electrical conductivity and hence is adapted to establish anddisestablish an electric circuit with the electrode 5 10.

Associated with the casing 4 in any manner in practice preferred, is asuitable housing 14, preferably of tubular form, and of electricalconductivity, which housing is provided with perforations 16 to allowfree movement of the kerosene oil 18 within the casing 4, so that theelectrode 12 may be easily moved to break circuit with the electrode asthe diaphragm 8 is vibrated, the

B housing 14 extending within close proximity with the electrode 10, butentirely free therefrom.

To any suitable point on the casing 4 is connected the electrical leadwire 20, which, of course, is electrically connected at all times to themov- 10 able electrode 12 through the metal casing 4 and metallichousing 14, another lead wire 22 being connected to a. wire ofpreferably smaller gauge 24, which is secured by a suitable construction26 to the electrode 10.

The fluid 18 permits the electrode 12 to break the circuit with theelectrode 10 an indefinite number of times without any arcing orroughening between the surfaces of the two, thus increasing the lifethereof. Further, a slight dash pct to effect is attained so that theelectrode 12 will have a positive movement.

As seen more particularly in Fig. 5, the casing 4, and hence thediaphragm 8 is inclined from the vertical, shown exaggerated in saidfigure, so

86 that when said diaphragm is at rest, and thus unail'ected by externalinfluences, the electrode 12, by gravity, will be in direct contact withthe elec- .'trode 10.

I! described, the diaphragm 8 may be in strict- 80 ly vertical position,as seen in the modification depicted in Fig. 3, in which the vibratorydiaphragm 8 with its electrode 10 coacts with the movable electrode 12,its movement being opposed by a spring 11 of comparatively slighttension,

85 which spring will positively hold said electrodes in contact but atthe same time permitting cir- I cuit interruption, when the diaphragm 8is vi- 'brated.

, In Figs. 4 and 6 we have illustrated two further modifications of ourinvention, Fig. 4 illustrating a simplified form of switch, thevibratory diaphragm 8 being mounted in a ring 5 of any pre 'ferred formand material, said diaphragm being mounted in said ring by suitablefasteners 6.

The casing 4", and indeed. the entire switch, are

also inclined in this form of our invention, the ring 5 having an arm1'? associated with said casing, which arm has a tubular housing 14 withthe mobile electrode 12 adapted to engage by gravity the electrode ill,which may be constructed as in the other form oi our invention, but hasa tubular portion 7 telescoping with the tubular housing 14 as thediaphragm 8 vibrates. It will be observed that the non-arcing fluid 18will by this construction have a free movement, and further, will alwaysprovide a wet surface for the electrode 12. If desired, the entrance tothe tubular portion '7 may be provided with a suitable material 9 toexclude extraneous material, such as dust.

In the form shown in Fig. 6, the switch 2 is vertically positioned, theconstruction being precisely the same as in the other forms of ourinvention, except that a small permanent magnet 11, which may be ofhorse shoe form, and suitably mounted, as by the arm 15, so that saidmagnet 11 will at all times attract the movable electrode 12 to makecontact with the electrode 10, until the vibration oi the diaphragm 8overcomes the attraction of the magnet 11 and breaks the circuit betweenthe electrodes 10 and 12.

In circuit with the vibratory switch 2, in the manner presently to bedescribed, is a relay 28 of suitable construction, and which may betermed the sound relay, having a coil 30 of a number of turns and gaugesuitable to conduct an electric current, either direct or alternating,such, for example, as used for household purposes, and supplied by theleads 32 and 34 (Fig. 10), said coil having a core 36 with which isassociated an armature 38, connected as desired to an armature lever 40,associated as preferred with the framework 42 of the relay 28, saidframework being provided with suitable adjusting means 44 ofconventional or olher form. See Fig. 7.

Associated with the relay 28 and the remaining elements of theinvention, in the manner presently to be described, is a second relay 46(Fig. 8), termed the motor relay, comprising coils 48 and 50, said coilsvarying in number of turns and wire gauge as in practice demanded andneeded, said coils being preferably mounted as shown in said figure forconvenience of assembly upon the framework of relay unit 46, althoughsaid arrangement is to be considered as suggessive merely.

Associated with the coils 48 and 50 is the core 52, with which in turnis associated the armature construction 54 having contact points 56 and58, associated with the electrodes 60 and 62 of conventional or o herform. The armature 54 with its plural contact points, may be pivoted tothe framework 64 of the motor relay as shown in Fig. 8. Any othersuitable construction may be substituted for that shown and justdescribed, so long as the essential elements, viz, the coils, core andarmature with plural contact points, are provided.

Reference is had more particularly to Fig. 10 in which is found adiagram of the electrical cir-- cuits. As seen in said figure, the leads32 and 34 are connected to some source of electrical energy, which maybe the usual household circuit, the lead 34 being in circuit with asuitable switch S, adapted to be opened or the circuit broken by aprojection 66 upon the closure D, as presently to be explained, whichswitch is in circuit with a second switch S by means of the wire 68,which switch is identical in construction and operation as the switch 5,said switch S being in circuit by the wire 'l'O with the motor M whichis adapted to actuate said closure or door D. As the projection 66 ismoved with the closure D to the end. of its stroke or movement, saidprojection, by contacting the switch S or S selectively the motorcircuit is automatically interrupted through the deenergizing of themotor relay coil 48 and consequent opening of the contact points 96 and56, and the closure in either direction of its movement brought to astandstill. The switches S and S are of such construction that they arealways normally in the closed position, and upon being momentarilyopened by projection 66 they immediately regain their closed positionautomatically.

The lead 34 is connected by means of the wire '72 to both the armature38 of the relay 28 and to one end of the coil 30, while the other end ofthe coil 30 is connected by the wire '74 to the wire 76, which in turnis in circuit with the wire 20 leading to the casing 4.

The other lead 32 from the source of electrical energy hereinbeforedescribed is in circuit by means of the wire '78 with the wire 22leading to the wire 24 connecting with the connection 26 to the convexelectrode 10. (See also Fig. 9).

The lead 32 is also in circuit with the armature 54 of the motor relay46 by means of the wire 80, and also with one end of the coil 50 by thewire 82.

The relays 28 and 46 are inter-connected with 1 the sound relay 28.

each other and with the switch 2 and motor M in the following manner:

The other end of the coil is connected by means of the wire 84 to thecontact point 86 of One end of the coil 48 is connected by the wire 88to the contact 56 of the motor relay 46, while the other end of saidcoil is connected by the wire 90 to the motor M. The other contact point58 of the motor relay 46 is connected by the wire 92 leading to the wire'76, which connects with the wire 74-to the coil 30 of the sound relay28, and also with the wire 20 leading to the casing 4 of the switch 2.

The circuit of the sound relay 28 is normally closed, and so long as thecoil 30 thereof is energized, the circuit through the contact point 94of the armature 38 will maintain the circuit of the motor relay coil 50open through the points 86 and 94.

Referring again to Fig. 10, the movable electrode 12 being in contactposition with the elece trode 10, a circuit is established through theWires 20 and 22, the wire 20 establishing a circuit by the wire 74, coil30, wire '72, lead 34. The wire 22 establishes the circuit through thewire '78, and lead 32. This energizes the coil 30, at-' tracting thearmature 38 and its contact 94 away from the contact 86, maintaining thecircuit through the motor relay coil 50 open.

The winding, electrical resistance, etc., of the sound relay 28 is inpractice determined by particular conditions, such, for example, as thecharacter of the electric current used, its .voltage etc. Said relayfunctions to operate the motor relay 46, which in turn operates themotor M, when the circuit of the sound relay 28 is interrupted by meansof the vibratory diaphragm of the switch 2.

As just stated, the motor relay 46, when energized by the sound relay28, functions to start the motor M. The coils 48 and 50 vary in turnsand wire gauge, depending upon the size of said motor. Any preferrednumber of contact points 96 and 98 on the armature 54 coacting withcontact points 56 and 58 on said relay may be used.

Assuming that the circuit is broken between the movable electrode 12 andthe electrode 10 on the diaphragm 8, caused by the vibration thereof,due to sound, as previously explained, the

- closed circuit, hereinbefore described, will be interrupted,de-energizing the coil 30, and thus permitting the armature 38 to haveits contact point 94 placed in engagement with the contact point 86.This establishes a circuit for the lead 34, wire 72, armature 38,contact points 94 and 86, wire 84, coil 50, wire 82 and the other lead32 leading to the source of electrical energy.

The coil 50 being thus energized, the armature 54 is attracted, placingthe contact points 96 and 98 respectively in contact with the contactpoints 56 and 58 of the relay 46. The current from the lead 32 thenpasses to wire 80, armature 54, contact points 96 and 56, wire 88, coil48, and wire 90 to motor M, the circuit being completed through lead 34,switch S, wire 68, switch 8, wire to motor M, operating said 7 motor tomove the door D through a conventional or other form of belt mechanism B(Fig. 1) associated in any preferred manner with said motor.

' At the same time that the coil 50 is energized, a circuit will beestablished from the electrical lead 32, wire 80, armature 54, contactpoints 98 and 58, wire 92, wire 76, wire 74, coil 30 of relay 28, wire72, to lead 34 re-establishing the circuit through said coil 30 whichattracts its armature 38, interrupting the circuit through the contactpoints 94 and 86, de-energizing coil 50 ready for the next start, andpermitting the electrode 12 to assume its original position with respectto the electrode 10 on the diaphragm 8, ready for the next start. Coil48 functions -to maintain relay 46 in closed position thus supplyingcurrent through contact points 96 and 56. to motor M for one cycle ofclosing or opening closure D until switches S or S are opened by theprojection 66.

It will be noted that this operation of reenergizing the coil 30 isindependent of the sound sensitive device 2, to insure constancy ofoperation of said motor, since it might be possible that the vibratorydiaphragm 8 would be affected by the vibration of the door or motorvehicle in operation. Coil 48 functions to maintain the relay 46 inclosed position for the period of one cycle-of opening or closing theclosure D, after coil 50 has been opened by relay 28.

The motor M, after being once started, moves the door or closure D untilthe projection 66 strikes selectively the switches S and S, which breaksthe motor circuit and de-energizes coil 48 which allows relay 46 toregain its open position and stops the motor and closure in the selectedposition. The sequence of operations of all parts in the foregoingdescription is repeated in identical manner during each cycle of openingor closing of the closure D.

The mechanism for actuating the motor M by light rays is depicted indiagrammatic form in the lower part of Fig. 10, and, of course, may beplaced in circuit with the motor relay 46, as presently to be described,but it is to bedistinctly understood that in practice the light circuitmay be operated independently, it, however, being preferred to place themechanism together in a single container so the apparatus will not beinterfered with and at the same time be readily assembled for adjustmentand repairs.

As seen in Fig. 10, a suitable relay L, conveniently termed the lightrelay, is in circuit with the motor relay 46 as is the sound relay 28and the operation and function are identical, except that the operationof the mechanism is caused by light waves rather than sound waves.

The circuit of the light relay L is established and disestablished withthe source of electrical energy, to which are connected the leads 32 and34, the motor relay 46 and the motor M by the leads 1'7 and 19, theformer connecting with the armature-23 of said light relay, whicharmature has a contact point .1: adapted to make and break the circuitthrough the contact y to which the lead 19 is connected.

The instant the coil of the relay L is energized, as hereinafterexplained, its core attracts the armature 23, closing the circuitthrough a: and y. This causes a circuit to be established between theleads 32, 34, 1'7, 19, wire 84, coil 50, wire 82, said coil attractingthe armature 54, to close the circuit through the contacts 96 and 56.establishing a circuit through the coil 48, wire 90, motor M, wire 70,switch S, wire 68 and switch S, wire 34, until interrupted by theselective opening of said switches. Since the operation isidentical withthat previously described in reference to the sound wave circuit,further detailed description is not believed needed.

To actuate, or cause the light relay to be energized, a device sensitiveto light rays must be provided. To this end any suitable device, such asa novel or .other form of photo-electric tube or cell it is provided,and is positioned at any convenient point such as the door jamb of thegarage where the light rays of say, one of the automobile head lamps,may reach the same.

As is known, a photo-electric tube or cell is a device which, whenconnected to a source of electrical energy, and maintained in a darkcondition, possesses a very high internal resistance, and permits noelectric current to iiow therethrough. As soon, however, as a beam oflight is allowed to fall upon said tube or cell, its condition isinstantly changed so that a very minute current may pass therethrough,depending upon the intensity of the light falling thereon.

To provide for said minute current, the leads 32 and 34 may be tapped atany convenient point, or separate leads may be used, and the ends ofsaid leads are placed in circuit with the primary coil (1 of a suitabletransformer T, having a secondary coil or winding b.

If desired said transformer may be of the adjustable type, as indicatedon Fig. 10, although this is not essential.

To detect and amplify the minute current flowing through the tube orcell it, any suitable rectifiers d may be employed, such as a pair ofmodified radio tubes, arranged in parallel, to provide for safety andcapacity, so that if one should for any reason become inactive, theother will still be available for use. Any preferred number of suchrectifiers or radio tubes may be used.

As seen iiq Fig. 10, a transformer T is provided, whichtransformer has aprimary coil a of a suitable number of wire turns, and which coil isalways in circuit with a source of electrical energy, supplied by meansof the leads 32 and 34. Said transformer is also provided with asecondary coil of a suitable number of turns, so that the voltage in thecoil a will be stepped down to a proper value in the coil b. The coil 1)is connected to the filaments 0 of the devices at by means of the wires31 and 33, the current in said coil heating said filaments so theybecome electron emissive in said devices d.

Positioned within each of the tubes or rectifiers d, is a suitable oxidecoated cathode e, which cathode becomes electron emitting when heated bythe filament c, said cathodes being in circuit with the primary windinga of the transformer T through the wires m and 11, either at apredetermined tap point 0, or one found by adjustment, as previouslystated, to provide the voltage needed.

The electron stream, thus emitted from the cathodes e, migratestherefrom to the plates in the device d, and furnishes a conductingcharge on the grids g in the devices d.

When the photo-electric tube h is in darkened condition, there iscontinuously maintained on the grids g a negative bias or electriccharge of suitable voltage, by means of the wire i connecting the wireit through a suitable fixed condenser a, wire it to the end Z of theprimary winding a of the transformer T, the function of said condenserbeing to provide a high resistance electro-static capacity leak to theground 41 for the grids g and 0, thus enabling the devices (1 and d togive valvular or relay control of the current through the light relay L.

Another suitable fixed condenser 25 of much greater capacity than thecondenser i is connected across the wires q and s of the light relay L,and for smoothing out the ripple of the pulsating direct currentrectified by devices 11 and 11, so that said relay will be able withmore positiveness to attract its armature 23. The wire (1 connects thecoil of the relay L, through the wire 12 to one end of the primarywinding a, to which, also is connected the lead 32, as seen in Fig. 10.

The plates 1 in the devices (1 are connected by the wires w to the wires, which, in turn, is connected by the wires t and u to thephotoelectric tube h. In order to insure stable and steady operation ofthe devices d, by reason of the static charge on the grids g, a groundwire 41 is provided.

In operation, when the photo-electric cell h. is rendered active bymeans of light rays falling thereon, as, for example, by the automobilehead lamp, a minute positive current in magnitude of a few microamperesflows from the lead 32, through wires 11 and q, the coil of the relay L,wires s, t, and u to the photo-electric cell it, through wires 12 and i,and onto the grids g. This minute current, of course, is insufficient inevery way to operate the relay L.

As previously explained, when said photoelectric cell is in darkenedcondition there is continuously maintained on the grids g a negativecharge of predetermined voltage by reason of the transformer T. Theminute positive charge flowing onto the grids g diminishes said negativecharge in an amount proportional to the light falling onto thephoto-electric tube h. This destroys the electrical balance of thedevices (I, causing a relatively heavy current to iiow from the plates fto the cathodes e, the circuit of which is provided by the lead 32,wires p and q, coil of the relay L, wires s and w, plates j, theelectronic spaces within the devices (I to cathodes e, wires m and n,and through that portion of the primary winding a between the points 0and 1, connecting with the other lead 34.

The electric current thus established is ample to energize the coil ofthe relay L, which attracts the armature 23 to close the contact pointsa: and 11, causing the motor relay 46 to function identically aspreviously described in connection with the sound sensitive device 2,and its relay 28.

It will be observed that we do not desire to be limited to the exactstructure of the devices 11, hereinbefore described in detail, sinceother types of radio or electron tubes may be used, and moreparticularly a novel or conventional Iorm of gas-filled electron tube,provided such devices have the proper and needed characteristics forproper association with the cell 71, transformer T and relay L. Further,the devices d and h. are rectifiers, and permit an alternating currentto pass through them in only one direction. The fixed condensers 9' and25 are used merely for insuring the proper operation of the devices 41,and may be used or not, or other suitable devices substituted therefor,depending upon the character and operation of the devices d.

It may also be noted, that while we intend our invention to be used inconnection with an alternating current by suitable changes a directcurrent may be employed.

In case it should be desired to render the entire apparatus inactive,suitable switches 51 and 53, positioned at any preferred point in thecircuits, may be provided.

Another important feature of our invention is that it may function as asafety device, when an automobile is positioned in a garage with itsdoors closed, and the engine running. As is well known, the poisonousqualities of the exhaust gases, due largely to the carbon monoxid gases,soon overcomes any individual present in the garage under suchconditions.

The sound sensitive device 2 being in circuit as previously described,the air pulsations caused by the explosions of the internal combustionengine cause the diaphragm 8 to vibrate, and, as previously explained,instantly causes the motor M to be actuated to open the garage doorsadmitting pure air into the garage.

Still another important feature of our'invention is that without theslightest change to any already installed door opening equipment, ourspecial apparatus may be placed in circuit with the motor of saidequipment, and the door may be operated to open and close, either bylight or sound waves. The apparatus disclosed on Fig.

10 may be conveniently stored within a small space, such as a suitableiron box, insuring safety andpreventing any tampering thereof byunauthorized persons.

In accordance with the provisions of the patent statutes, we havedescribed the principle of operation of our invention together with theapparatus which we now consider to represent the best embodimentthereof; but we desire to have it understood that the apparatus shown isonly illustrative, and that the invention can be carried out by othermeans.

We claim as our invention:

1. In an apparatus of the class described, including aconventionalclosure, an electric motor for actuating said closure, and a source ofelectrical energy for operating said motor, the combination of a switchmechanism, a first relay in circuit with said source of electricalenergy, a motor relay in circuit with said first relay, said source ofelectrical energy, and said switch, said switch being adapted tomaintain a closed circult with said first relay, so said first relaywill be energized by said source of electrical energy, but when saidswitch is operated by a motor vehicle accessory when placed in directalignment therewith, the circuit of said switch is opened, to close thecircuit of said motor relay, said source of electrical energy and saidmotor to operate said closure.

2. In an apparatus of the class described, including a conventionalclosure, an electric motor for actuating said closure, and a source ofelectrical energy for operating said motor, the combination of a set ofswitches in circuit with said motor and said source of electricalenergy, means on said closure for selectively operating said switcheswhen said closure is operated, a switch mechanism, sensitive to theeffect produced by the operation of a motor vehicle accessory, whenpositioned in direct alignment therewith and at a distance therefrom, aset of relays in circuit with said motor, said source of electricalenergy, said switch mechanism and with each other, whereby, when saidswitch mechanism is operated by said motor vehicle accessory, said motorwill operate said closure, said means on said closure being adapted tobreak said circuit through said set of switches, selectively to stopsaid motor. and an emergency switch for controlling said circuits.

3. In an apparatus of the class described, including a conventionalclosure, an electric motor for actuating said closure, and a source ofelec trical energy for operating said motor, the combination of at leasttwo switches, responsive to vibrations caused by the operation of twodifferent motor vehicle accessories, when said accessories areselectively placed in direct alignment with at least one of saidswitches, and electrical means in circuit with said switches, said motorand said source of electrical energy, whereby said motor vehicleaccessories may selectively be caused to operate at least one of saidswitches when placed in direct alignment therewith and operated at adistance from said closure.

4. In an apparatus of the class described, including a conventionalclosure, an electric motor for actuating said closure, and a source ofelectrical energy for operating said motor, the combination of at leasttwo switches, responsive to vibrations caused by the operation of twodifferent motor vehicle accessories, when said accessories areselectively positioned in direct alignment with at least one of saidswitches, and a set of interconnected relays in circuit with saidswitches and said source of electrical energy, whereby said switches mayselectively cause said source of electrical energy to actuate said motorto operate said closure.

5. In an apparatus of the class described including a conventionalclosure, an electric motor for actuating said closure, and a source ofelectric energy for operating said motor, the combination of at leasttwo switches responsive to vibrations caused by the operation of twodifferent motor vehicle accessories, when said accessories areselectively positioned in direct alignment with at least one ofsaid'switches, and a set of interconnected relays in circuit with saidswitches and said source of electrical energy whereby said switches mayselectively cause said source of electrical energy to actuate said motorto operate said closure.

NATHAN E. JOAQUIN. EDWARD PRAETORIUS.

